//
// JavaScript Event Calendar
//
// Version: 1.0
// Date: November 15, 1998
// For information: http://members.aol.com/kevinilsen  or kilsen@m-vation.com
//

// Configurable values are set to defaults here; can override them before calling Calendar( ) from the HTML page

var SpecialDay=1;	// 1=Sunday, 2=Monday, . . . 7=Saturday
var FontSize=5;
var ColorBackground="ffffcc";
var ColorSpecialDay = "red";
var ColorToday = "green";
var ColorEvent = "blue";

// Initialize the range of the calendar to Jan - Dec of the current year.  Calls to DefineEvent( ) will change this
// as needed; it is also possible to explicitly override the range before calling Calendar( ) from the HTML page.

var today = new Date();
var FirstMonth=GetFullYear(today) * 100 + 1;
var LastMonth=FirstMonth + 11;

// Events[] is a SPARSE array; Call DefineEvent( ) to populate it
var Events = new Array;
var count=0;

// Each event is defined by calling the DefineEvent( ) routine with the following parameters:
//
//   DefineEvent(EventDate, EventDescription, EventLink, Image, Width, Height)
//        EventDate is a numeric value in the format YYYYMMDD
//        EvenDescription is a string that can include embedded HTML tags (e.g., <BR>, <strong>, etc.)
//        EventLink is the URL of the target page if a hyperlink is desired from this event entry
//        Image is the URL of the image if you want to display an image with this event
//        Width is the width of the image in pixels
//        Height is the height of the image in pixels

function DefineEvent(EventDate, EventDescription, EventLink, Image, Width, Height) {
	var tmp;

	// Build the HTML string for this event: image (optional), link (optional), and description
	tmp = "";
	if (Image != "")
		tmp = tmp + '<img src="' + Image + '"  width="' + Width + '" height="' + Height + '" align="left" valign="top">';
	if (EventLink != "")
		tmp = tmp + '<a class="footer2" href="' + EventLink + '">';
	tmp = tmp + EventDescription;
	if (EventLink != "") tmp = tmp + '</a>';

	// If an event already exists for this date, append the new event to it.
	if (Events[EventDate])
		Events[EventDate] += "<BR>" + tmp;
	else
		Events[EventDate] = tmp;

	// Adjust the minimum and maximum month & year to include this date
	tmp = Math.floor(EventDate / 100);
	if (tmp < FirstMonth) FirstMonth = tmp;
	if (tmp > LastMonth) LastMonth = tmp;
}

// Utility function to populate an array with values
function arr() {
	for (var n=0;n<arr.arguments.length;n++) {
		this[n+1] = arr.arguments[n];
	}
}

// Create the array of month names (used in various places)
var months = new arr("January","February","March","April","May","June","July","August","September","October","November","December");
var weekdays = new arr("Sun","Mon","Tue","Wed","Thu","Fri","Sat");

// Calendar( ) is the only routine that needs to be called to display the calendar

function Calendar( ) {
	var curdy, curmo, yr, mo, dy, dayofweek, yearmonth, bgn, lastday, jump;
	var thispage = window.location.pathname;

	// Save current day and month for comparison
	curdy = today.getDate();
	curmo = today.getMonth()+1;

	// Default to current month and year
	mo = curmo;
	yr = GetFullYear(today);
	yearmonth = (yr * 100) + mo;
	count=0;

	// If querystring parameter is present, get the month/year ("calendar.htm?YYYYMM")
	if (location.search.length > 1) {
		yearmonth = parseInt(location.search.substring(1,location.search.length));
		if ((""+yearmonth).length == 6) {
			mo = yearmonth % 100;
			yr = (yearmonth - mo) / 100;
		}
	}

	// Constrain to the range of months with events
	if (yearmonth < FirstMonth) {
		mo = FirstMonth % 100;
		yr = (FirstMonth - mo) / 100;
		yearmonth = FirstMonth;
	}
	if (yearmonth > LastMonth) {
		mo = LastMonth % 100;
		yr = (LastMonth - mo) / 100;
		yearmonth = LastMonth;
	}

	// Create a datae object for the first day of the desired month
	bgn = new Date(months[mo] + " 1," + yr);
	// Get the day-of-week of the first day, and the # days in the month
	dayofweek = bgn.getDay();
	lastday = NumDaysIn(mo,yr);
	document.write("<font class='submenusel'>"+months[mo]+" "+yr+"<BR></FONT>");
	dy = 1;
	while (dy <= lastday) {
		for (var i=1;i<=7;i++) {
			if (dy > lastday) {
			}
			else {
				ShowDate(yr,mo,dy,i,curmo,curdy);
				dy++;
			}
		}
	}
	if (count == 0) {
		document.write("<font class='footer2'></font><br>");
	}

	// Next month
	tmpyearmonth = yearmonth;
	yearmonth = NextYearMonth(yearmonth);
	mo = yearmonth % 100;
	yr = (yearmonth - mo) /100;
	count=0;

	// Create a datae object for the first day of the desired month
	bgn = new Date(months[mo] + " 1," + yr);
	// Get the day-of-week of the first day, and the # days in the month
	dayofweek = bgn.getDay();
	lastday = NumDaysIn(mo,yr);
	document.write("<BR><font class='submenusel'>"+months[mo]+" "+yr+"<BR></FONT>");
	dy = 1;
	while (dy <= lastday) {
		for (var i=1;i<=7;i++) {
			if (dy > lastday) {
			}
			else {
				ShowDate(yr,mo,dy,i,curmo,curdy);
				dy++;
			}
		}
	}
	if (count == 0) {
		document.write("<font class='footer2'></font><br>");
	}

	jump = "<BR>";
	if (tmpyearmonth > FirstMonth)
		jump += '<a class="footer2" href="' + thispage + '?'+PrevYearMonth(tmpyearmonth)+'"> '+'&lt;'+'</a>';
	if ((tmpyearmonth > FirstMonth) && (yearmonth < LastMonth))
		jump += "&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;     ";
	if (tmpyearmonth < LastMonth)
		jump += '<a class="footer2" href="' + thispage + '?'+NextYearMonth(tmpyearmonth)+'"> '+'&gt;'+'</a>';
	document.write("<font class='footer2'>"+jump+"</font>");
}

// Display a date in the appropriate color, with events (if there are any)

function ShowDate(yr, mo, dy, dayofweek, currentmonth, currentday) {
	var ind, HighlightEvent, tmp;

	ind = (((yr * 100) + mo) * 100) + dy;
	if (Events[ind]) {
		tmp = Events[ind];
		count++;
		document.write("<font class='footer2'>"+dy+"<BR>"+tmp+"<BR></font>");
	} else tmp="&nbsp;<BR>&nbsp;";
}


// Remaining routines are utilities used above

function NumDaysIn(mo,yr) {
	if (mo==4 || mo==6 || mo==9 || mo==11) return 30;
	else if ((mo==2) && LeapYear(yr)) return 29;
	else if (mo==2) return 28;
	else return 31;
}

function LeapYear(yr) {
	if (((yr % 4 == 0) && yr % 100 != 0) || yr % 400 == 0) return true;
	else return false;
}

// fixes a Netscape 2 and 3 bug
function GetFullYear(d) { // d is a date object
	var yr;

	yr = d.getYear();
	if (yr < 1000)
	yr +=1900;
	return yr;
}

function PrevMonth(mth) {
	if (mth == 1) return 12;
	else return (mth-1);
}

function NextMonth(mth) {
	if (mth == 12) return 1;
	else return (mth+1);
}

function PrevYearMonth(yrmth) {
	if ((yrmth % 100) == 1) return ((yrmth-100)+11);
	else return (yrmth-1);
}

function NextYearMonth(yrmth) {
	if ((yrmth % 100) == 12) return ((yrmth-11)+100);
	else return (yrmth+1);
}

function JumpTo(calendar, thispage) {
	var sel, yrmo;

	sel = calendar.selectedIndex;
	yrmo = calendar.form.jumpmonth[sel].value;
	document.location = thispage + "?" + yrmo;
}

function BuildSelectionList(current,thispage) {
	var mo, yr, yearmonth;

	yearmonth = FirstMonth;
	document.write("<select name=\"jumpmonth\" size=1 onchange=\"JumpTo(this,'" + thispage + "')\">");
	while (yearmonth <= LastMonth) {
		mo = yearmonth % 100;
		yr = (yearmonth - mo) / 100;
		document.write("<option value=");
		document.write(yearmonth);
		if (yearmonth == current) document.write(" selected");
		document.write(">");
		document.write(months[mo]+" "+yr);
		yearmonth = NextYearMonth(yearmonth);
	}
	document.write("</select>");
}